turbo indentification

[SAndreasen]

i have a holset turbo and the only numbers i can find on it are 25D1 ON THE COMPRESOR housing and 3821B, 3593344 and 9 j 1 on the exhaust housing do these numbers make any sense to any one ? if somebody does know what turbo this is would it work good to replace the stock turbo on my 92 ? thanks for any help

 

[Shadrach]

There should be a tag on the intake housing, where the air comes out going to the CAC. It should have 2 seven digit numbers on it, one starting with 35 and the other with 38 and maybe a serial number as well, which doesn't help at all. Do you know where that turbo came from? Holset turbos were used on other engines as well as Cummins. The simplest thing to do to yours is to change to a 16cm exhaust housing which will help it spool up faster. It will also create more heat. Shadrach

 

[SAndreasen]

i have looked at the turbo twice and i can not find any other nubers or tags it is waste gated and the exhaust housing looks to be at least half the size as the exhast housing thats on the turbo in the truck now . the compressor housing looks to be about the same size as whats on the trcuk now also the the exhaust elbow coming of the new tiurbo is 4 inch

 

[cerberusiam]

Sounds like an HX35/12 off a second gen. The 25D1 is tickling an ancient memory of seeing that on a 2nd gen. Can you post up a pic?

 

[SAndreasen]

i will try to get a picture of the turbo on here in a couple of days . if its an HX35/12 that would be a fairly decent upgarde wouldnt it

 

[cerberusiam]

i will try to get a picture of the turbo on here in a couple of days . if its an HX35/12 that would be a fairly decent upgarde wouldnt it

Yes, it would.

 

[dodgenstein]

If it has a 4" outlet, it isn't an HX35.

 

[OKish]

that assembly number crosses over to a he351, post a pic. if the compressor outlet has a 90 degree cast bend into it, it will be a 03 or newer he351.

 

[cerberusiam]

that assembly number crosses over to a he351, post a pic. if the compressor outlet has a 90 degree cast bend into it, it will be a 03 or newer he351.

The HE351 is 04. 5 and newer, the older ones are an HE341.

 

[OKish]

The HE351 is 04. 5 and newer, the older ones are an HE341.

ahhh, my bad. i know nothing about 3rd gens. im a 1st and 2nd gen guy.

 

[SAndreasen]

the outlet does have a 90 degree bend so is that a pretty good turbo

 

[OKish]

the outlet does have a 90 degree bend so is that a pretty good turbo

It will spool fast, but only has a 9cm3 exh housing on it so it will run hot. Not much of an upgrade from a h1c... . i actually would sell it.

 

[SAndreasen]

what should i look for as far as turbos go what models

 

[cerberusiam]

the outlet does have a 90 degree bend so is that a pretty good turbo

Yes, its an excellent turbo to upgrade a 1st gen with. The HE351 sports a 60mm inducer and 65 mm exducer. The hot side housing is a open throat 9 cm^3 design that has the capability to flow what 12 cm^3 housings on the HX's will. A little porting and clean up and they will do more.



The turbo will spool quickly and cleanly with big injectors and easily support up to 500 HP before things get a bit toasty. Remove the electronic control and replace it with a plug ATS diesel has, drill the compressor for a boost reference and add a boost elbow and you are set.



Don't worry too much about the housing size as its flow and cam lobe seperation that will make a difference in your drive pressures and EGT's. These turbos really shine in the 25-35 psi range and will do quite well into the 40's if you have the fuel.



You will have to upgrade to a 4" down pipe and either source the hump hoses to drop to the stock IC connectors or upgrade to better IC. If you got it cheap or free and its good it will perform as well as $1500 of aftermarket turbo will. Can't beat THAT with a stick.

 

[cerberusiam]

on it so it will run hot. Not much of an upgrade from a h1c.....

I will have to disagree 100% with those statements. You run hot on EGT's when you over run the map on the compressor, not from the housing size. Thats where the housing design and 65 mm exducer come into play.



An HE351 is way more than an upgrade to an H1C. It is for all purposes an evolution of the H1 and not even in the same class. The really great thing is this turbo in its STOCK form is easily retro-fitted to ANY previous B-series engines and will support 95% of these engines WITHOUT modifications. Evolution is a good thing and really breathes some life into a VE powered 12V.

 

[OKish]

Hmm, just for ****s and giggles i stuck a he351 on my 89 and egt's were through the roof with the wastegate set at 38 psi. I was seeing 14-1500 degrees by 65mph. I can barely hit 1250 with the h1c at 40 psi unloaded.

 

[cerberusiam]

Hmm, just for ****s and giggles i stuck a he351 on my 89 and egt's were through the roof with the wastegate set at 38 psi. I was seeing 14-1500 degrees by 65mph. I can barely hit 1250 with the h1c at 40 psi unloaded.

Seems you had a couple of other issues there that are clouding the results cuz that is way off all the experience I have. A lack of an IC is going to hurt big time when pushing those pressures. Even a 16cm housing with a 58mm wheel will not perform that well beyond 30 psi with enough fuel.



Those numbers simply don't correlate to a turbo that will roll 23k over 6-7% grades and barely top 1300 degrees with a 450 hp tune. Every application I have seen an HE351 in has been an IC one on 1st, 2nd, and 3rd gens and it is a step up over the stockers. Maybe the IC has a lot more impact than it is credited with?



The 40 psi on a stock H1C and still at or under 1250 I was never achievable with a large housing on my truck. Beyond 30-32 psi the EGT's climbed faster than the tach. Way out of its map.

 

[OKish]

Well, i must be delusional then. LOL.

 

[SAndreasen]

ive turned my pump up quite a bit and right now i can hit 1300 empty in 5th gear if i stand on it so i am trying to find sumthn to help egts

 

[cerberusiam]

ive turned my pump up quite a bit and right now i can hit 1300 empty in 5th gear if i stand on it so i am trying to find sumthn to help egts

Yup, thats what we're all looking for.



The 1300 is not bad pushing it. If thats all you can get depending on what your doing its ok. You just don't have alot of room for growth. Just have to try it and see what happens. Depending on fueling and setup no 2 trucks will react exactly the same way.



Got any pics yet?